Our original post is at the link above. @Jocelyn_Intel redirected us to the Intel Developer Zone.
We solved this problem as follows:
1. Apparently, we had used some incorrect binaries in the Flash Image Tool (FIT) after build & stitch.
1.1. Once we corrected this mistake, debug messages appeared.
Slimboot proceeds as shown in the attachment (EarlyCmdTrainingFailed.txt).
What must be done to get past the error shown in the attachment ?
Sorry for the delayed reply - we had a long weekend & I made it back to the office only today.
Like I mentioned in my linked post, we use the i7 processor.
Anyway, we were able to go past even the Early Command Training error by changing a Slimboot configuration file.
So our issue is solved.